Updating Reactor code with PHP 8.1 features

[msmakouz]

Q	A
Bugfix?	❌
Breaks BC?	✔️
New feature?	❌
Issues	#512

[codecov]

Codecov Report

Merging #638 (541b0b8) into 3.0 (0c85859) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.0     #638      +/-   ##
============================================
- Coverage     82.45%   82.45%   -0.01%     
+ Complexity     5763     5762       -1     
============================================
  Files           667      667              
  Lines         14401    14394       -7     
============================================
- Hits          11875    11868       -7     
  Misses         2526     2526              

Impacted Files	Coverage Δ
src/Reactor/src/Aggregator/Constants.php	100.00% <ø> (ø)
src/Reactor/src/Aggregator/Methods.php	100.00% <ø> (ø)
src/Reactor/src/Aggregator/Properties.php	100.00% <ø> (ø)
src/Reactor/src/Traits/NamedTrait.php	100.00% <ø> (ø)
src/Reactor/src/Traits/SerializerTrait.php	100.00% <ø> (ø)
src/Reactor/src/AbstractDeclaration.php	100.00% <100.00%> (ø)
src/Reactor/src/Aggregator.php	100.00% <100.00%> (ø)
src/Reactor/src/Aggregator/Parameters.php	100.00% <100.00%> (ø)
src/Reactor/src/ClassDeclaration.php	100.00% <100.00%> (ø)
src/Reactor/src/FileDeclaration.php	100.00% <100.00%> (ø)
... and 13 more

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